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UCC38501DW
PFC IC Average Current 100kHz 20-SOIC
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Manufacturer:
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Mfr.Part #:
UCC38501DW
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Datasheet:
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Topology:
Boost
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Control mode:
CCM
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Switching frequency (max) (kHz):
200
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UVLO thresholds on/off (V):
10.5/10
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EDA/CAD Models:
Availability: 5461 PCS
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UCC38501DW General Description
The UCC2850x family provides all of the control functions necessary for an active power-factor-corrected preregulator and a second-stage dc-to-dc converter. The controller achieves near-unity power factor by shaping the ac input line current waveform to correspond to the ac input-line voltage using average current-mode control. The dc-to-dc converter uses peak current-mode control to perform the step-down power conversion.
The PFC stage is leading-edge modulated while the second stage is trailing-edge synchronized to allow for minimum overlap between the boost and PWM switches. This reduces ripple current in the bulk-output capacitor.In order to operate with over three-to-one range of input-line voltages, a line feedforward (VFF) is used to keep input power constant with varying input voltage. Generation of VFF is accomplished using IAC in conjunction with an external single-pole filter. This not only reduces external parts count, but also avoids the use of high-voltage components, offering a lower-cost solution. The multiplier then divides the line current by the square of VFF.
The UCC2850x PFC section incorporates a low offset-voltage amplifier with 7.5-V reference, a highly-linear multiplier capable of a wide current range, a high-bandwidth, low offset-current amplifier, with a novel noise-attenuation configuration, PWM comparator and latch, and a high-current output driver. Additional PFC features include over-voltage protection, zero-power detection to turn off the output when VAOUT is below 0.33 V and peak current and power limiting.
The dc-to-dc section relies on an error signal generated on the secondary-side and processes it by performing peak current mode control. The dc-to-dc section also features current limiting, a controlled soft-start, preset operating range with selectable options, and 50% maximum duty cycle.
The UCC28500 and UCC28502 have a wide PFC-UVLO threshold (16.5 V/10 V) for bootstrap bias supply operation. The UCC28501 and UCC28503 are designed with a narrow UVLO range (10.5 V/10 V) more suitable for fixed bias operation. The UCC28500 and UCC28501 have a narrow UVLO threshold for PWM stage (to allow operation down to 75% of nominal bulk voltage), while the UCC28502 and UCC38503 are configured for a much wider operation range for the PWM stage (down to 50% of bulk nominal voltage).
Available in 20-pin N and DW packages.
Key Features
- Combines PFC and Downstream Converter Controls
- Controls Boost Preregulator to Near-Unity Power Factor
- Accurate Power Limiting
- Improved Feedforward Line Regulation
- Peak Current-Mode Control in Second Stage
- Programmable Oscillator
- Leading-Edge/Trailing-Edge Modulation for Reduced Output Ripple
- Low Start-up Supply Current
- Synchronized Second Stage Start-Up, with Programmable Soft-start
- Programmable Second Stage Shutdown
Specifications
Topology | Boost | Control mode | CCM |
Switching frequency (max) (kHz) | 200 | UVLO thresholds on/off (V) | 10.5/10 |
Vin (max) (V) | 18 | Features | < 150 W applications, Average current mode, Continuous Control Mode, Enable, Overvoltage protection, Supports Flyback |
Rating | Catalog | Operating temperature range (°C) | 0 to 70 |
Duty cycle (max) (%) | 100 | Pin Count | 20 |
Released Date | Apr 14, 2021 | Last Modified Date | Mar 7, 2023 4:10 PM UTC |
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Availability: 5461 PCS
+BOMQty. | Unit Price | Ext. Price |
---|---|---|
1+ | $16.853 | $16.85 |
200+ | $6.523 | $1,304.60 |
500+ | $6.293 | $3,146.50 |
1000+ | $6.180 | $6,180.00 |
The prices below are for reference only.
All bill of materials (BOM) can be sent via email to [email protected], or fill below form to Quote for UCC38501DW, guaranteed quotes back within 12hr.